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(No Model.)

F. H. MGDOWBLL.

ORE ORUSHER.

Patented Oct. 16, 1883.

#vnf-1 UNITED STATES PATENT @einen FREDERICK H. MCDOVELL, OF NEW YORIQQN.- Y.

o R E CR U s H E R. y SPECIFICATION forlnng part Of Letters Patent :Nm/286,723, dated October 16, 1883.

nppncation filed January 27, issaffivo model.)

.Toa/ZZ whom it may concern:

Be it known that l, FREDERICK H. McDow- ELL, of New York city, in the county and State of New York, have invented certain new and useful Improvements in Ore-Crushers, of which the following is a specification.

I have devised a single simple machine which will receive lumps of ore of vvarying dimensions and treat them, first, by simple compres-y sion to break them small, and subsequently by a grinding action, and discharge the mate'- rial finely comminuted. It may be adjusted to grind to different degrees of fineness.

The accompanying drawings represent a machine constructed according to my invention.

Figure 1 is a longitudinal vertical section. Fig. 2 is a plan view.

Referring to the drawings and to the letters of reference marked thereon, Ais a stout framing, of cast-iron or other suitable material, and

lB C a steel or chilled-iron facing-piece, secured thereon by bolts D and nutsd, and also held firmly against displacement by cogs or keys E, fitting in transverse scores or grooves formed partly in the framing A and partly in the hard facingpiece B C.

F is a stout j aw, of cast-iron or other suitable material, rocking on a stout shaft, F.

G H is a facing-piece of steel or iron, secured by bolts D and nuts d, and also held firmly against displacement by keys E, fitted in transverse scores or grooves formed partly in the jaw F and partly in the hard facingpiece G I-I.

M is a constantlyrevolving shaft, carryingV a broad eccentric, M.

P is a stout connecting-rod or toggle having a suitably-formed end, I, engaged on the eccentric M', and a suitably-formed end, P2, engaging in a bearing under the end of the j aw F. There are straps R, which t over proj ections in the sides of the jaw F and in the sides of the connecting-rod I), which insure the sufficiently-prompt return of the jaw after each Yclosing movement.

Vciable.

position of the axis of motion of the jaw. The

between the upper portions is V-shaped, and adapted to receive large stones or lumps of ore, and by the vibrationsof the jaw F to crack them into successively smaller pieces as they descend, and to allow them to descend farther until they reach the curved portions, in which I they will be subjected to a grinding action. The plane surfaces of the upper parts and the curved surfaces of the lower portions are ridged transversely. I have provided for resisting the disturbing strains to which the hard facing-pieces are' exposed in their junctions with the stationary framing and with the jaw, respectively. The action in the lower portions tends to shift the hard facing-pieces B and G successively upward and downward. This strain is resisted by the cogs or keys E. The bolt-s D and nuts d, in combinationwith the other parts, hold the whole very firmly. The curved rubbing-surfaces.can be set nearer together or farther apart, and the jaw-surfaces above will be correspondingly set nearer together or farther apart; but a small adjustment of these upper parts will be less appre- The changes are made by'shifting the bearings of the jaw are held in boxes, each of which may be a single boX, or composed of two or more pieces, with babbitting or other provisions for makingV durable bearingisurfaces and any ordinary or suitable provisions for eX- cluding dust and supplying and retaining oil. Their positions are adjusted by shimmingpieces W', Awhich are placed on the one side or the other until the right position is obtained. Vhen these pieces are adjusted rightly, the whole is compressed firmly by a stout screw,

WV', so that the box has a firm bearing either directly against the back of its recess or against one or more shimming-pieces behind it.

It will be observed that the grooves in the chilled-iron face-pieces B C and G H are a little nearertogether than the corresponding grooves in the surfaces which support them. It follows from this fact that when the keys E are driven in, these scores or grooves, each matching partly in a groove in the chilled iron and partly in a groove in the ordinary cast-iron behind it, there is a Alocking action, due to the absence of coincidence of position, which aids to hold the chilled iron to the supporting-iron with far greater firmness than justing the position of the axis of the jow, and io consequently varying the neness of the produet und the rapidity with which the ere may be feel through 5 but I prefer the means shown.

I claim as my invention- The fastening-bolts D, nnts'd, and eogs or keys E, in combination with each other und With the framing A, vibrating jaw F, andY faeing-pieees B C G H, all arranged for joint operation, substantially as and for the herein speoiiied.

In testimonyT whereof I have hereunto set my hand, at New York city, New York, this 25th day of January, 1883, in the presenee of two subscribing Witneises.

FREDERICK II. MODWTELL.

Vitiiesses:

XVM. C. Dm', CHARLES l. Semilla.

purposes 

